Corner construction for molding flasks



Jan. 3, 1928. 1,654,531

D. C. COBLE CORNER CONSTRUCTION FOR MOLDING FLASKS Filed Sept. 16, 1925 2 Sheets-Sheet 1 INVENTOR ATTORNEY Jan. 3, 1928.

Filed Sept. 16, 1925 2 Sheets-Sheet 2 ATTORNEY Patented Jan; 3, 1928.

IlAVID C. COBLE,'O'.F YORK, PENNSYLVANIA, ASSIGNOR, TO AMERICAN FOUNDRY EQUIP- I 1,654,531 PATENT OFFlCE-,

MENT COMPANY, OF NEW YORK, N." Y., A CORPORATION OF OHIO.

Application file'd september 16, 1925. Serial No. 56,598,.

The invention relates to 'molding flasks such as used in the making of molds for castings and the like. The better type of molding flask is preferably made from some light non-corroding, long-wearing metal such as cast aluminum. It is not always practical to make a flask section in one piece, especially in larger sizes of flask. Therefore, it is the custom to make the several side members of the flask separate, joining them together at the corners. It is necessary that the corner constructions be cheap, rugged and long wearing. They must not become loose or allow sand or moisture to get into F the cracks or joints formed at the corner. The corner must be as strong as the rest of the'flask section and also as long wearing.

According to this invention a corner construction for a molding flask is provided in which the adjoining ends of the side members'are provided with diagonal pro ecting corner flanges which have connecting openings therein. The side members are connected together by casting a suitable metal which is preferably softer. than the material of the side members between the diagonal flanges and into the connecting openings to rigidly and securely connect the s 1de members together. Furthermore, provision so is made so that should the corner become loose due to abnormal and unusual usage of the flask section, the connecting metal may be hammered or peened to tighten the joint between the members. I

Various other objects and advantages of the invention will be obvious from the following particular descrlption of one form of mechanism embodying the invention or from an inspection of the accompanying 40 drawings; and the invention also. consists in certain new and novel features of construction and combinations of parts hereinafter set forth and claimed.

In the accompanying drawings I have shown for purpose of illustration one form of mechanism embodying the invention, in which Fig. 1 is a plan view of a molding flask to which the invention is applied;

of one end of one of the side members making up the flask;

Fig. 2 is a fragmentary detail perspective Figs. 3 and/. are fragmentary detail perspectlves of the .side member shown in Fig. 2-look1ng at opposite sides thereof;

F1g. 5 1s an end elevation of one of the side members looking along the direction of the length thereof;

Flg 6 is a perspective of a corner constructlon according to the invention;

[Fig 7 is a plan view of a corner construction according to the invention;

Fig. 8 is a section on the line 8-8 of Fig. I

7; and

Fig. 9 is a section on the line 9-9 of In the following description and in the claims parts will be identified by specific names for convenience, but they are intended to be as generic in their application to similar parts as the. art will permit.

Referring to Fig. 1 of the drawing, a section of a molding flask is shown with theinvention applied thereto for purposes of illustration. It will be understood that this construction may be applied to the lower or drag section, the upper or cope section, onto any flask section used in the molding art. The flask section maybe rectangular 1n shape comprising four side members connected together by corner constructions according to the invention. Each sidemember has preferably an upwardly and inwardly extending side wall 1 with an outwardly extending top flange 2 and an'outwardly extending bottom flange 3. The inclined side walls are provided to give the section a taper so that the section may be more readily removed from the mold after the molding operation has been performed, as is clearly understood in the art. The upper surface of the top flange 2 and lower surface of the bottom flange 3 are preferably plane andflat to provide true meeting surfaces for adjacent sections as is well understood in the art.

Since all corner constructions are the same it is only necessary for one to be described in detail. The side wall 1.0f each'pair of adjoining side members may end in a diagonalextending connecting flange 4 extending from the top flange 2 to .the bottom flange 3. The adjacent connecting flanges 4 are provided preferably with concave oppositely disposed faces 5, the other faces 6 ofthe diagonal flanges being plane. Each connecting flange 4: is provided with a plurality of connecting openings 7 extending between its faces, each connecting opening being provided with a reduced throat 8 extending substantially from the inner side face 10 of the opening near the concave face 5 to the outer side face 11 of the opening near the plane face as'sliown best in Fig. 9. Both the top and bottom faces and the side faces of each opening 7 are flared from said throat 8 on one side to the concave face 5 and on the other side to the plane face 6 of the diagonal flange at as clearly shown in the drawing. It will be readily understood that the connecting openings 7 are made in the shape shown for the purpose of forming an excellent interlocking joint between the side members and the connecting metal which is cast between them. The adjoining side members may be connected together by placing them at right angles with their concave faces 5 opposite and spaced from each other. Connecting metal, preferably some alloy of aluminum and preferably softer than the material of the side members is cast into the space between the concave faces 5 and into the connecting openings 7, suitable retaining means (not shown) being used for preventing the escape of the molten metal'during the process of casting as will be clearly understood.

l/Vhen the cast metal 12 becomes solid a rigid and strong joint is provided between the side members. It should be noted that the connecting openings 7 face sufficiently outwardly to allow hammering or peening of the connecting material 12 should oc casion ever require to tighten the corner.

It will be seen that a cornerconstruction according to the invention provides a joint between side members which is simple, cheap, rugged and easy to make. The joint will be at least as strong as the sections themselves and will last as long as the flask. There is little chance of the corner ever becoming loose because the cast metal when once set will always hold its shape and its interlocking engagement with the side members will hold the side members in the proper relation. However, if the side members ever become loose due for. example, to abnormal or rough usage it can be easily seen that the connecting material 12 may be suit ably peened and compressed against the faces of the side members and connecting openings 7 to make the corner as tight andrigid as it was when originally made.

lVhile I have shown and described and have pointed out in the annexed claims certain novel features of the invention, it will be understood that various-omissions, substitutions and changes in the forms and details of the device illustrated and in its 0pflange, and connecting metal located in space d between said projecting flanges and in said connecting openings to rigidly connect said side members together.

2. Corner construction for a molding flask comprising side members each having a side wall ending in a projecting flange which has inner and outer faces, said projecting flanges bein placed opposite each other in spaced relation, said projecting flanges each having a connecting opening extending between its inner and outer faces, a face of each of said openings flaring toward the outer face of the flange, and cast metal in the space between said projecting flan es and in said connecting openings to rigid y connect said side members together.

3. Corner construction fora molding flask comprising rectangularly arranged side members, each having a sidewall ending in a diagonal flange which has inner and outer faces, said diagonal flanges being placed 0pposite each other in spaced relation, said diagonal flanges each having a plurality of connecting openings extending between its outer and inner faces, faces of said openings flaring toward the outer faces of said flanges, and connecting metal located in the space between said diagonal flanges and in said connecting openings to rigidly connect said side members together.

4. Corner construction for a molding flask comprising rectangularly arranged side members, each having a side wall ending in a diagonal flange which has inner and outer faces, said diagonal flanges being placed opposite each other in spaced relation, said diagonal flanges each having a plurality of connecting openings extending between its outer and inner faces, faces of said openings flaring toward the outer faces of said flanges, and cast metal in the space between said diagonal flanges and in said connecting openings to rigidly connect said side members together.

5. Corner construction for a molding flask comprising rectangularly arranged side members, each having an inclined side wall having top and bottom outwardly extending flanges, each side wall ending in a diagonal flange having a concave face and a flat face, said diagonal flanges being placed opposite each other with their concave faces in spaced relation, said diagonal flanges each having a plurality of connecting openings extending between its faces, each connecting opening having a reduced throat extending substantially from the inner side face of the opening near said concave face to the outer side face near said fiat face, the faces of said opening flaring from said throat on one side to said concave face on the other side to said flat face, and cast metal in the space between said concave faces and into said connecting openings to rigidly connect said side members together.

6. A molding flask comprising a plurality of side members provided with openings therethrough, fiat connecting members between adjoining side members, and means for connecting said connecting members to said side members by interlocking engagement in said openings.

7. A molding flask comprisin a plurality of side members, each side mem er having a diagonal flange with a plurality of connecting openings therein, connecting members between the diagonal flanges of adjoining side members for connecting said side members together, each connecting member com prising a fiat body having connecting projections completely filling said connecting openings.

In testimony whereof I have hereunto set my hand.

DAVID C. COBLE. 

